mjhjmtu

I am new to LDAP. I have configured ldap local server running centos 7. Use article
https://www.itzgeek.com/how-tos/linux/centos-how-tos/step-step-openldap-server-configuration-centos-7-rhel-7.html.
Now my LDAP server is running without any issue
In my ldap server firewall is disabled. however, selinux is enabled.
Also, I migrate my local users to ldap db using migrationtools and it was also successful.
Also, I install and configure phpldapadmin and it was also successful.
Then I have connected my another ldap server as client( i installed sssd, krb5-workstation. use authconfig-tui to connect), just for authentication.

When I test my ldap connectivity (from clientserver) using

[root@ldapclient ~]# getent passwd user1

user1:*:1001:1001:user1:/home/user1:/bin/bash

[root@ldapclient ~]# id user1

uid=1001(user1) gid=1001 groups=1001

[root@ldapclient ~]# id testfromphpldapadmin

uid=1003(testfromphpldapadmin) gid=1010(ldapusers) groups=1010(ldapusers)

(testfromphpldapadmin - create from using phpldapadmin
user1 - user that migrate using migration tools)

according to the previous result, I was thinking that my ldap authentication just works without any issue

But when I tried to ssh using that ldap user accounts

login as: user1

user1@centclient's password:

Access denied

can someone help me with this?
Thanks